Dont use a sponge mate, they hold onto grit etc and cant properly be cleaned. get yourself a lambswool mitt, and use the two bucket method. i would also suggest getting a couple of microfibre mitts to wash the lower panels, an keep the lambswool for the top half of the car. [Y]As for products, as oobster says, polished bliss is as good as any if not better for sourcing products, especially the blackfire range.
hope this helps.
cheers
Iain